Why NBTL
The anticipated peak demand of Meghalaya for 2022-23 timeframe was 478MW and the envisaged installed capacity of about 360MW, majority of these are from hydro generations. In low Hydro scenarios, the dispatch from these stations was expected to be limited to about 180MW, thereby creating a deficit in the supply of about 300MW. Accordingly, to simulate the worst case, a low hydro peak demand scenario had been chosen to study the requirement of additional connections to meet the growing demand of Meghalaya.
Due to the proximity of Bongaigaon TPS from the western part of Meghalaya, a large quantum of power flows through BTPS – Agia – Medinipathar – Nangalbibra corridor making it N-1 non-compliant.
Therefore, a new 220/132kV substation was required at Nangalbibra which would be fed from Bongaigaon 400/220kV Substation through 400kV D/c line (initially operated at 220kV).
Strengthening Grid Connectivity for Western Meghalaya
- This interconnection will reduce the critical loading on BTPS – Agia 220kV D/c line of AEGCL and improve the voltage profile as well as reliability of power supply in the western part of Meghalaya.
- Further, for drawl of power from Nangalbibra (ISTS), MePTCL has planned to develop Nangalbibra (ISTS) – Nangalbibra (Meghalaya) 132kV (Single Moose) D/c line.
- In addition, MePTCL has planning to develop Nangalbibra (ISTS) – Mawngap 220kV D/c line so that Bongaigaon (POWERGRID) – Nangalbibra (ISTS) – Mawngap (MePTCL) – Byrnihat (MePTCL) – Bongaigaon (POWERGRID) ring would be completed for power transfer with reliablility. Considering future load growth, space for expansion of Nangalbibra (ISTS) 220/132kV S/s to 400kV later would also be kept.
- For reliable supply of power and improved voltage profile in western most part of Meghalaya, a second source from Assam side through Hatsinghmari (AEGCL) – Ampati (MePTCL) 132kV D/c line had been planned.
